Answers section

Questions 4.2

1. Which component of air will be:
   1. the first to liquefy during cooling ------------------------
   2. the last to liquefy during cooling --------------------------
   3. the first to boil during distillation --------------------------------
2. Search the Internet for --------------------------------------------
   1. two uses of helium -----------------------------------------------
   2. one use of argon ---------------------------------------------
   3. one use of neon --------------------------------------------
   4. one use of carbon (IV) oxide -----------------------------------